The billionaire banker, who in mid-September called bitcoin "a fraud" said- on Friday "who cares about bitcoin"- while speaking at a conference in Washington DC, according to Bloomberg.-

He added "governments are going to crush bitcoin one day."-

During JPMorgan"s earning call on Thursday, Dimon said he wouldn"t put bitcoin into "the category of important things in the world" and that he wasn"t "going to talk about bitcoin anymore."

The massive growth of the market has piqued the interest of folks from Main Street to Wall Street, but Wall Street"s top execs -mdash;- who have seen their fair share of bubbles -mdash; have voiced their- concern about the cryptocurrency.-

Ray Dalio, the founder of the world"s largest hedge fund, echoed Dimon"s criticisms of bitcoin on September 19.-

The billionaire founder of Bridgewater Associates said bitcoin "is a bubble" during an appearance on CNBC"s Squawk Box.-

And in- a recent interview with Bloomberg News- last week, Larry Fink,- the head of the BlackRock, the world"s largest investor, said he thinks the explosive growth of bitcoin points to nefarious behavior.-

"It just identifies how much money laundering there is being done in the world," Fink said. "How much people are trying to move currencies from one place to another."